Analysis of Trace Elements in Natural Waters

Brondi, M.; Dall'Aglio, M.; Ghiara, E.; Gragnani, R.

doi:10.1080/02757548608080734

Cited by 10 publications

(2 citation statements)

References 2 publications

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“…Dithizone titration The choice of the buffer solution was strictly related to the possibility of directly determining, via titration with DZ, the content of Zn, Cu, Cd and Pb. The extraction conditions were already experimentally studied in our laboratory, and those used in the present work were selected in order to ensure an efficient extraction of Zn, Cd, Pb and Cu, while for Cr(VI), Mo, V, Ni and Co the APDC/ CHCl 3 (pH3) extraction resulted to be the best choice (Brondi et al 1986). It is possible that there is a contribution of other elements other than Zn, Cu, Pb and Cd to the total titrated, but the essential of the expected information is retained.…”

Section: Sequential Extractionmentioning

confidence: 99%

“…In the past, the colorimetric determination of Zn, Cu, Cd and Pb with DZ in chloroform (CHCl 3 ) at pH9.3 was extensively used in our laboratory for in-field preconcentration of metals and preliminary analysis of fresh waters (Brondi et al 1986). Anyway, the use of toxic CHCl 3 has discouraged this procedure, and at the beginning of our work, different experimental conditions have been evaluated in order to obtain a rapid and relatively non-toxic method for heavy metals determination through DZ titration.…”

Section: Introductionmentioning

confidence: 99%

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Proposal of a simple screening method for a rapid preliminary evaluation of “heavy metals” mobility in soils of contaminated sites

2010

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Purpose Risks associated to "heavy metals" (HM) soil contamination depend not only on their total content but, mostly, on their mobility. Many extraction procedures have been developed to evaluate HM mobility in contaminated soils, but they are generally time consuming (especially the sequential extraction procedures (SEPs)) and consequently applicable on a limited number of samples. For this reason, a simple screening method, applicable even "in field", has been proposed in order to obtain a rapid evaluation of HM mobility in polluted soils, mainly focused on the fraction associated to Fe and Mn oxide/hydroxides. Materials and methods A buffer solution of trisodium citrate and hydroxylamine hydrochloride was used as extractant for a single-step leaching test. The choice of this buffered solution was strictly related to the possibility of directly determining, via titration with dithizone (DZ), the content of Zn, Cu, Pb and Cd, which are among the most representative contaminants in highly mineralised soils. Moreover, the extraction solution is similar, aside from for the pH value, which is the one used in the BCR SEP second step. The analysis of bivalents ions through DZ titration was exploited in order to further simplify and quicken the whole procedure. The proposed method generically measures, in few minutes, the concentration of total extractable "heavy metals" expressed as molL −1 without distinguishing between elements. Results and discussionThe proposed screening method has been developed and applied on soil samples collected from rural, urban and mining areas, representing different situation of soil contamination. Results were compared with data obtained from the BCR procedure. Conclusions The screening method demonstrated to be a reliable tool for a rapid evaluation of metals mobility. Therefore, it could be very useful, even "in field", both to guide the sampling activity on site and to monitor the efficacy of the subsequent remediation action.

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Section: Sequential Extractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%